CVE-2026-43640

Bitwarden Server prior to v2026.4.1 does not require master-password re-authentication when retrieving or rotating an organization's SCIM API key, allowing an authenticated user with SCIM management privileges to obtain the key using only a valid session.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/bitwarden/server/commit/eb251d9bf80724c87b187661783b9354d1784083	Patch
https://github.com/bitwarden/server/pull/7403	Issue Tracking Patch
https://github.com/bitwarden/server/releases/tag/v2026.4.1	Release Notes
https://sanjokkarki.com.np/blog/bitwarden-scim-key-bypass	Exploit Third Party Advisory
https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-scim-api-key	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:*

History

26 Oct 2026, 18:10

Type	Values Removed	Values Added
Summary		(es) El Servidor Bitwarden anterior a la v2026.4.1 no requiere reautenticación con la contraseña maestra al recuperar o rotar la clave API SCIM de una organización, lo que permite a un usuario autenticado con privilegios de gestión SCIM obtener la clave utilizando únicamente una sesión válida.

Information

Published : 2026-05-11 18:16

Updated : 2026-10-26 18:10

NVD link : CVE-2026-43640

Mitre link : CVE-2026-43640

CVE.ORG link : CVE-2026-43640

JSON object : View

Products Affected

bitwarden

server

CWE

CWE-303

Incorrect Implementation of Authentication Algorithm

{"id": "CVE-2026-43640", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43640", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-05-13T12:38:55.932890Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.6, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"repo": "https://github.com/bitwarden/server", "vendor": "bitwarden", "product": "server", "versions": [{"status": "affected", "version": "0", "lessThan": "2026.4.1", "versionType": "semver"}], "packageURL": "pkg:github/bitwarden/server", "defaultStatus": "affected"}]}], "published": "2026-05-11T18:16:37.110", "references": [{"url": "https://github.com/bitwarden/server/commit/eb251d9bf80724c87b187661783b9354d1784083", "tags": ["Patch"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/bitwarden/server/pull/7403", "tags": ["Issue Tracking", "Patch"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/bitwarden/server/releases/tag/v2026.4.1", "tags": ["Release Notes"], "source": "disclosure@vulncheck.com"}, {"url": "https://sanjokkarki.com.np/blog/bitwarden-scim-key-bypass", "tags": ["Exploit", "Third Party Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-scim-api-key", "tags": ["Third Party Advisory"], "source": "disclosure@vulncheck.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-303"}]}], "descriptions": [{"lang": "en", "value": "Bitwarden Server prior to v2026.4.1 does not require master-password re-authentication when retrieving or rotating an organization's SCIM API key, allowing an authenticated user with SCIM management privileges to obtain the key using only a valid session."}, {"lang": "es", "value": "El Servidor Bitwarden anterior a la v2026.4.1 no requiere reautenticaci\u00f3n con la contrase\u00f1a maestra al recuperar o rotar la clave API SCIM de una organizaci\u00f3n, lo que permite a un usuario autenticado con privilegios de gesti\u00f3n SCIM obtener la clave utilizando \u00fanicamente una sesi\u00f3n v\u00e1lida."}], "lastModified": "2026-10-26T18:10:00.173", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "56702BEE-9E3B-4949-8137-4FA0407C0635", "versionEndExcluding": "2026.4.1"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}